Device for applying insecticides to mill elevators



June 19, 1934. w. F-'. MITCHELL DEVICE FOR APPLYING INSECTICIDES TO MILL ELEVATORS Filed May 27, 1933 Fig. 2.

Inventor, WLLLiam R MitcheLL,

Fig. 6.

Attorneys Patented June 19, 1934 v I I 1,963,501

PATENT oFF1cE DEVICE Eo'a APPLYING INSECTICIDES To MILL ELEVATORS William P. Mitchell, Indianapolis, Ind. Application May 27, 1933, Serial No, 678,160

9Claims; (01299-40) This invention relates to means for applying an insecticide to elevators in flour mills and thelike. Considerable difficulty is encountered in these elevators in that they become clogged with webs resulting from the invasion of moths. If an insecticide can be applied to the interior of these elevators continuously,'then the moths will not enter the elevators or if they do, they will be repelled or killed before webs are produced.

It is a primary object of my invention to provide a device extremely simple in form which may be applied without diiliculty to the elevator. A further ilnportantadvantage of my invention is that the insecticide may be utilized in the crystalline or dry state rather than a solution. A still further important advantage-of my invention is that the rate of evaporation of the insecticide employed may be controlledin accordance with the conditions encountered and that the insecticide container may be readily removed'for inspection.

These and other objects and advantages of the invention will become apparent to those versed in the art in the following description of one particular form of my invention as illustrated in the accompanying drawing, in which Fig. 1 is a fragmentary vertical-section through a leg of an elevator with a'device embodying my invention applied thereto, on a reduced scale;

Fig. 2, a central vertical fragmentary section through a device embodying my invention;

Fig. 3, a top plan view; I

Fig. 1, a-bottom'plan view;

Fig. 5, a horizontal transverse section on the line's-s n Fig. 2, and

Fig. 6,a modified form of the invention in fragmentary side elevation employing a forced draft.

Like characters of reference indicate like parts throughout the several views in'the drawing.

I form an upper body portion-l0 here shown as having an inverted cup shape open from the underside and having a mounting ear 11 extending vertically upward from the side wall. Near the top end of the body and from the side thereof extends a short nipple 12 providing the sole outlet from the upper part of the body. The leg 13 of the elevator, preferably that leg containing the ascending buckets 14, is bored through to provide a hole into which the nipple 12 is inserted -so as to provide a passage discharging, into the leg 13 from the body 10 through the nipple 12. The location of this hole through the leg 13 is preferably immediately above the inflowing spout 15 so that as the buckets 14 travel upwardly past the opening in the nipple 12, there is created a flow of air upwardly inthe leg tending to draw air from the body 10 through the nipple 12.

A lower body portion 16 is formed to have its upper open end telescope within the lower portion of the body 10 and to have pins 17 and 18 extending laterally from the sides of the body portion or cup 16 to enter into the slots 19 and 20 respectively to be carried upwardly and therearound and down to rest on the lower end of the curved slots toform a bayonet type connection. Boththe upper and lower body portions 10 and' 16 respectively are preferably made out of metal although other materials may be employed, the essential feature being in this regard that the two body portions be substantial and unalfected by insecticides to be employed. 1 T

Within the lower body portion 16 I fix a cylindrical receptacle 21 having a perforate Well, here shown as being woven wire screen. This receptacle 21 is secured to the bottom of the body portion 16 and is left open at its top end. Spaced circumferentially around the receptacle 21 are a I plurality of holes 22 through the base of the portion 16. I also form a metal sleeve 23 to telescope over the receptacle 21 from the upper end thereofto permit the sleeve to be raised and loweredthereover and frictionally retained at any selected position. This sleeve 23 is also left open at the top end.

In employing the invention, the upper body portion l0'is attached to the leg 13 as above indicated, this portion'being more or less permanentlymaintained in position. The lower body portion or cup 16 is removed and the insecticide to be employed, preferably in crystalline form, is

dropped into the'receptacle'21. The sleeve 23 is pushed down over the receptacle to leave 'a gap between its lower end and the bas e of the cup as indicated in Fig. 2, whereupon the cup 16 is re tained to have its upper end telescope within thebody portion 10 and secured thereto by carrying the'pins 17 and 18 around in the slots 19 and 20 as above indicated. Now when the buckets 14 are moving in the leg 13 and carrying the air' therein along in the direction of the buckets; the fiow of air produced by'that movement also sets up a current of air through the applied device, drawing air through the holes 22 up through the cup 16, the body 10 and through the nipple 12 into the leg 13. Some air of course will be drawn up through the receptacle 21 through the openings remaining uncovered at the lower end thereof to pass over the crystals within the receptacle and escape from the top carrying the vapors becoming volatilized from the crystals along with that air and hence into the elevator leg. The amount passing through the receptacle is controlled by the position of the sleeve 23 on the receptacle, more air passing through the receptacle when the sleeve is raised into some such position as indicated by dash lines, Fig. 2. When the elevator buckets 14 come to rest, there is very little or no air flow through the leg 13 and hence through the cup 16 and body 10 so that the insecticide is automatically drawn from the device only when the elevators are in operation. By this operation, a considerable saving in the insecticide is effected. Of course a multiple number of the devices may be employed particularly where the elevator is of great length.

Where there is not a sufficient current of air produced by movement of the buckets 14 in the elevator leg, it is then preferable to employ some means for creating a fiow of air from the device into the elevator leg such as I have indicated in Fig. 6 where the outlet spout 24 is carried from the top of the body portion 10 in place of the nipple 12 in the form above described. This spout 24 is provided with. an air pressure tube 25 zentering therein to have a nozzle directed toward the outlet of the spout so that compressed air under slight pressure may be discharged within the spout to create an ejecting of the air from the body and cup 10 and 16 respectively so as to cause a more positive flow of the insecticide into the elevator leg 13.

While I have herein shown and described my invention in the one form as now best known to me, it is obvious that structural changes may be employed without departing from the spirit of the invention and I therefore do not desire to be limited to this precise form beyond the limitations as may be imposed by the following claims.

I claim:

1. In an insecticide diifusing device, a two part container having upper and lower body portions, having an upper outlet in the upper body portion, an insecticide receptacle in the lower body portion, said lower body portion having entrance holes through its base spaced around said receptacle, and said lower body portion being removably attached to the upper portion and an additional air-flow causative means connected with the upper outlet.

2. In combination with an elevator leg having buckets moving therein causing a displacement of air in the leg, an insecticide diffuser comprising an upper body portion, a nipple extending from the portion and entering said leg to discharge therewithin, means for attaching the portion to the leg, a lower body portion detachably engaged with the upper portion, and an insecticide receptacle in the lower portion, said lower portion having inlet openings in its base around the receptacle.

3. In an insecticide diffusing device, a two part container having upper and lower body portions, having an upper outlet in the upper body portion, an insecticide receptacle in the lower body portion, said lower body portion having entrance holes through its base spaced around said receptacle, and said lower body portion being removably attached to the upper portion, said receptacle having a perforate wall and being open across its top end and an additional air-flow causitive means connected with the upper outlet.

4. In an insecticide diffusing device, a two part container having upper and lower body portions, having an upper outlet in the upper body portion, an insecticide receptacle in the lower body portion, said lower body portion having entrance holes through its base spaced around said receptacle, and said lower body portion being removably attached to the upper portion, said receptacle having a perforate wall and being open across its top end, and a sleeve slidably fitted over the receptacle frictionally engaging therewith to remain in selected positions therealong and an additional air-flow causative means connected with the upper outlet.

5. In an insecticide diffuser, a container having an outlet at its top and an inlet at its bottom, an insecticide receptacle in the container extending upwardly therein in spaced relation from the container wall, said receptacle having openings through its wall, and a sleeve adjustably fitting over the receptacle adapted to be moved over said openings and an additional air-flow causative means connected with the upper outlet.

6. In an insecticide diffuser, a container having an outlet at its top and an inlet at its bottom, an insecticide receptacle in the container extending upwardly therein in spaced relation from the container wall, said receptacle having openings through its wall, and a sleeve adjustably fitting over the receptacle adapted to be moved over said openings and an additional air-flow causative means connected with the upper outlet, both said receptacle and said sleeve being open at the upper ends, and said inlet being between the receptacle and the container wall.

7. In an insecticide diffusing device for a mill elevator having buckets movable in a leg thereof, container means for holding a volatile insecticide, and conducting means interconnecting said container means with said elevator leg, said container means having a passageway therethrough affording conducting means for permitting air to be drawn therethrough into said leg, said air being drawn only by movement of the buckets in the leg whereby a current of air passes through said container means only when said buckets are in motion so that insecticide is not carried into the leg when the buckets are stationary.

8. In combination with an elevator leg having buckets moving therein in one direction only causing a displacement of air and partial vacuum in the leg, a container means holding a volatile insecticide, and having a discharge into the leg.

9. In combination with an elevator leg having buckets moving therein causing a displacement of air in the leg, a container means holding a volatile insecticide, and having a discharge into the leg, and a spout discharging compressed air at the discharge from the container into the leg.

WILLIAM P. MITCHELL. 

